Removed test_files from gemspec
Removed test_files from gemspec

I was just looking through the code installed for teaspoon, and I noticed that the /spec/dummy directory is huge. It turns out that rubygems is packaging up not only /spec/dummy, but also all the tempfiles and logfiles there *at the time of packaging*.

The latest consensus is that test_files shouldn't be packaged with a gem anyway (see https://github.com/bundler/bundler/pull/3207) because they're never used, so rather than filtering out /spec/dummy/log and /spec/dummy/tmp I've prevented rubygems from packing test files at all.
iainbeeston/teaspoon,modeset/teaspoon,modeset/teaspoon,andresbravog/teaspoon,iainbeeston/teaspoon,derby-developers/teaspoon,beni55/teaspoon,iainbeeston/teaspoon,andresbravog/teaspoon,bouk/teaspoon,modeset/teaspoon,beni55/teaspoon,derby-developers/teaspoon,bouk/teaspoon,bouk/teaspoon,andresbravog/teaspoon,beni55/teaspoon,derby-developers/teaspoon